Little Snitch is described as 'Firewall tool for monitoring, controlling, and alerting on outgoing network connections, with real-time user notifications and customizable rule-based access control' and is a very popular Firewall in the network & admin category. There are more than 25 alternatives to Little Snitch for a variety of platforms, including Windows, Mac, Android, Linux and iPhone apps. The best Little Snitch alternative is Portmaster, which is both free and Open Source. Other great apps like Little Snitch are LuLu by Objective-See, GlassWire, NetGuard and NetLimiter.
NetGenius is a modern Internet connection monitoring, control and optimization tool. It lets you watch the apps using your Internet in real-time, control their access, and get detailed usage reports. Bandwidth-sensitive applications like voice calls, videos or games can be...
appNetworkCounter is a simple tool for Windows that counts and displays the number of TCP/UDP bytes and packets sent and received by every application on your system.
Armor2net personal firewall software stops hackers, data thieves, and protects your PC from Internet-borne threats. Armor2net firewall can meet your requirements for Internet security and Internet privacy.
With InJoy Firewall™ 4.0 you can say good-bye to old-generation Firewall solutions that were difficult to implement, manage and measure — InJoy Firewall™ is different...
Outbound firewall for apps, blocking apps from accessing internet. Useful for reducing data usage when tethering to mobile data, or on a slower wifi connection.
Most users think TripMode is a great Little Snitch alternative.
DataCever allows you to monitor and control internet traffic , allowing you to know what consumes your data plan.
Filseclab Personal Firewall Professional Edition is one of the most important software of Filseclab, it is very easy to use and also very powerful. It can provide more secure protection for your PC, and it is FREE.
FireWally is a free firewall app for Mac, powered by Apple Intelligence and designed for anyone who wants to take full control of their online activity.
Wallix Pro Firewall prevents intruders from accessing your computer and that’s the main objective for a computer firewall. It automatically detects and blocks attacks through a comprehensive examination of all inbound and outbound information to your computer.
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I like TripMode as an alternative to LittleSnitch because it's simpler UI resembles iOS and it's easy to monitor and block app internet usage. It's also significantly cheaper than LittleSnitch.